J.D. Martinez makes his Mets debut after he was sidelined by back issues

Six-time All-Star J.D. Martinez joined the New York Mets on Friday, more than a month after he signed and hopeful the back woes that delayed his debut are a thing of the past. Martinez batted fifth against the St. Louis Cardinals Friday night — in between former NL home run king Pete Alonso and former NL batting champ Jeff McNeil — and went 2-for-4 with an RBI double in a 4-2 loss. The Mets are hopeful Martinez, whose 291 homers since 2014 are the fifth-most in the majors, can lengthen a lineup that has scored three runs or fewer 13 times in 25 games this season.